Consider the coordinates given and decide whether BC and DE are parallel, perpendicular, or neither

Question

B(3, -3), C(-3, -7), D(6, -5), E(0, 4)
B(4, -7), C(1, 2), D(2, -8), E(-4, 10)
B(-4, 0), C(2, 2), D(1, 4), E(2, 7)